The Ludlow Foundries curly tail casement stay matches the curly tail fastener & is available in three lengths. The stay is a modern reproduction of the classic blacksmiths curly tail stay which has been made for centuries. Curly tail stays & fasteners can been seen in many country properties both old & new. Three Popular Lengths Available The curly tail stay is available in the usual three popular sizes; 203mm, 254mm & 305mm. These sizes will suit almost all window sizes from small fanlight windows to normal casements. The general rule.. .